ZBTB18 and microcephaly: This is exemplified by the observation that: (1) three deletions sparing AKT3 (one encompassing ZBTB18 and HNRNPU and two HNRNPU but not ZBTB18) were also associated with microcephaly, and (2) all patients with deletion comprising AKT3 but extending to and including ZBTB18 and/or HNRNPU had microcephaly.